Pkopelleb mounting



R. T. SVENDSEN ET AL sept 2o 1932. PROPELLER MOUNTING Re 18 6oz OriginalFiled April 30, 1928 5 Sheets-Sheet l In ven tore Raab-RT Tl/ENDSENDAVID 6. CHANDLER A #born ya R. T. svx-:NnslnaN ET AL v 20, 1932'PROPELLER MOUNTING Re, 13,602

original Fiied April 3o, 192e 5 sheets-sheet g2 Invenors Rose-RT 7.'vENDsE/v DA VID 6. CHANDLER Sym @JW A tra-o rn aye Reissued Sept. 20,ltll Re. lSZ

revelar Prion:

ROBERT T. SVENDSEN AND EJAVID G. CHANELER, OF MNNEAPOLIS, MIINNIEISOTA.`

PROPELLER MOUNTING Urignal No. 1,735,660, dated November 12, 1929,Serial No. 274,027, led April 30, 1928. Application 'for reissue iledNovember 5, 1931.

This invention relates to new and useful improvement in propellermountings, and an object of the invention is to provide such anapparatus adapted to be mounted at t-he rear 5 end of an ordinary boator vessel, and comprising a supporting member normally depending intothe water and having a propeller journaled atthe lower end thereof, andthe mounting being adapted to swing in substantially a vertical plane,whereby the propeller may be elevated to an inoperative position.

A further object of the invention is to provide a propeller mountingadapted to swing l' upon an axis arranged transversely of the boat,whereby the mounting 'may be vertically adjusted to change the positionof the propeller in the water, and a strut having one .end connectedwith the lower end of the 1go mounting and normally positioned to beengaged by an obstruction in the water and to automatically elevate thepropeller and its mounting to prevent the latter from engaging theobstruction.

A further object is to provide a propeller mounting comprising asupporting member having a propeller journ aled in the lower endthereof, and the lower end of the mounting being adapted to swing aboutan upright tjgn axis, whereby the propeller may be adjusted to guide thevessel through the water, and also whereby the movement of the vesselmay be reversed. I

A further object is to provide a propeller f v mounting comprising apropeller supporting member having one end secured to an engine andhaving a propeller journaled in the opposite end thereof and adapted tobe positioned beneath the bottom of the vessel, and the enn gine beingmounted for pivotal movement upon an axis arranged transversely oi" thevessel, whereby .the propeller and its mounting may be swung to aposition out of the water or above the bottom of the vessel so as topre- L vent the propeller from striking the lalre bottom and otherobstructions.`

Serial No. 573,264.

A further object is to provide an apparatus of the class described,wherein the engine and propeller mounting are connected together as aunit, and the unit is pivotallyi mounted within the boat and projectsthrough the rear wall thereof, and the relative location of thepropeller with respect to the pivot, upon which the unit is mounted, issuch that the propeller will effectively propel the boat while the'strutrides on the lake bottom, the raising and lowering of the propeller notmateiilally changing the effectiveness of the prope er. f

A further object resides in the particulary arrangement ot' the drivingconnection between the engine and propeller, which in cludes a driveshaft, an intermediate shaft, and a propeller shaft, geared together insuch a manner, with respect to the angle of the propeller blades, thatthe propeller constantly tends to rotate or swing about the axis of theintermediate shaft, but is locked against such movement by a suitablelock adapted for manual operation.

A further object is to provide in a propeller mounting, a transmissionhousing carrying a propeller, a drive shaft for the propeller extendingfrom the housing` to an engine mounted within the boat, a pivotalsupport for the housing7 means for turning the propeller to guide theboat and means permitting said mounting and propeller to raiseautomatically-when the propeller engages an obstruction in the water.

Other objects of the invention reside in the pivotal. mounting of thepropeller supporting member and vengine in the boat or vessel; the meansprovided for swinging the propeller about an upright aXis to control thesteering of the vessel and its movement forwardly and backwardly; themeans provided for manually adjusting theposition of the propeller; thestrut having a pivotal connection with the lower end of the propeller,supporting member and having a pivotal sliding connection with thebottom of the vessel, and normally positioned to be engaged by anobstruction in the water, whereby it will be moved upwardly and lift thepropeller out of the path of such obstruction; the means providedformanually rais-- ing and lowering the propeller with respect to the boat;the means provided for preventing leakage at the point where thepropeller mounting projects through the rear wall of the boat; theconstruction of the steering mechanism; the particular arrangement ofthe controls with respect to the axis of the pivots supporting themounting, whereby foreshortening of the connections is prevented, whenraising and lowering the propeller; the relative location of the aXisabout which the engine and propeller mounting swing, with respect to thepropeller, which is such as to prevent the propeller from lifting, whenoperating to reverse the movement of the boat, and which also functionsto eliminate excessive strains from the rear end ofthe boat, should thepropeller be shifted into reverse While the boat is traveling forwardlyat high speed; and, in the general construction of the apparatus, as awhole. f

The particular object of the invention, therefore, is to provide animproved propel.- ler mounting.

Other objects of the invention will appear from the followingdescription and accompanyinv drawings and will be pointed out in theannexed claims.

ln the accompanying drawings, there has been disclosed a structuredesigned to carry out the various objects of the invention, but it is tobe understood that the invention is not confined to the exact featuresshown' as various changes may be made within the scope of the claimswhich follow.

In the drawings: i

Figure 1 is a vertical sectional view showing the rear portion of a boator vessel., with t-he invention applied thereto;

Figure 2 is a view similar to Figure 1, but showing the propellerelevated to a position substantially above the level of the bottom ofthe boat;

Figure 3'is a detail sectional view on the line 3 3 of Figure 1, showingthe means provided for adjusting the position of the prlopeller tocontrol the steering of the vesse f Figure 4 is an enlarged detailedsectional View on the line 4-4 of Figure 1;

Figure 5 is a detail sectional view on the line 5 5 of Figure 1, showingthe means for retaining the propeller in' forward and reverse positions;

Figure 6 is a view illustrating a modified form wherein the engine isfixedly mounted in the vessel; I

Figure 7 is a side elevation of Figure 6;

Figure 8 is a plan view, showing another modified form wherein thepropeller driving shaft is likewise mounted for swinging movement in avertical plane, and showing it connected to twin engines; and

Figure 9 is a detailed sectional view on c the line 99 of Figure 8.

In the selected embodiment of the invention here shown, there isillustrated, for purposes of disclosure, the rear portion 1 of vanrotation therein, as shown in Figure 1. The

upper end of this sleeve has a head 11 seated against the annular seator face 12 of the hub 8, as shown in Figure 1. A member 13 is secured tothe sleeve 9 by such means as a cap screw or bolt 14 which, it willbenoted, is mounted in the wall of the member 13 and has its inner endreceived in threaded engagement with the wall of the sleeve 9. Thus, it

will be noted that the member 13 `and the housing 15, at thel lower endthereof, are mounted for swinging movement about the axis of the sleeve9.

A drive shaft 16 is rotatably mounted in a sleeve 17, mounted for rotarymovement in bearings 18 and 19, provided in the tubular casing 5. Thesleeve 17 has a head 21 seated against the face 22, provided at one endof the casing 5, as shown in Figure 1. One end of the shaft 16 isoperatively connected with the engine crank shaft 23 by means of asuitable clutch 24, operable by a clutch lever 25, having a rod 26leading therefrom to the drivers seat, usually provided at the forwardend of the boat. The rear end of the drive shaft 16 has a beveled pinion27 secured thereto which constantly meshes with a bevel gear 28,terminally and non-rotatably secured to the upper end of an intermediateshaft 29. A bevel pinion 31 is secured to the lower end of theintermediate shaft 29 and meshes with a pinion 32, secured to thepropeller shaft 33, and having a propeller 34 mounted thereon as shownin Figure 1. The propeller shaft 33 is supported in a suitableanti-friction bearing 35and a sleeve bearing 36. Suitable take-upwashers 37 are provided adjacent the sleeve bearing 36 to take up endplay of the propeller shaft 33. A cap 38 is provided in the lowerhousing 15 whereby access may be had to the interior thereof. The screw14 securely locks the member 13 to the sleeve 9 so that the propeller 34will beL swung about the axis ofthe intermediate shaft 29,k when thesleeve is rotated. The weight of the propeller and its associated'partswill be carried bythe head 11j of the sleeve 9 engaging the upper face12 of the hub 8 of the transmission housing 6..

Means are provided for relatively swinging the propeller about the axisof the shaft 29 to guide the boat in its course. Such means comprises agear segment' 39 rotatably mounted uponthe head 11 of the sleeve 9.' The-segment 39 meshes with a relatively smaller segment 41, terminallyprovided upon the sleeve 17, mounted in the tubular casing 5. A spiralgear 42 is keyed to the opposite end ofthe sleeve 17 and meshes with asimilar gear43, secured to a short shaft 44 mounted in suit'- ablebearings as shown in Figure 4. A flanged pulley or wheel 45 is securedto the shaft 44 adapted to have a cord or cable 46 coiled thereabout,the sections of whichpass under suitable guide pulleys 47, shown inFigure 2. The pulleys 47 are so located that the' points of contact ofthe cables therewith, will be substantially in alinement with the axesof the pivots 3, thereby preventingr shortening orlengthening of thecables 46, when the mounting is vvertically adjusted.

An important feature of the invention resides in the means provided forshifting the propeller into forward and reverse positions. Such means isshown in Figures 1, 3, and 5 and comprises a plate 48 having a centralopening 49 adapted to receive the head 11 of the sleeve 9. Abutments 51are. provided in the walls of the opening 49 adapted to be engaged by adetent 52, provided on one side of the head 11, as particularly shown inFigure 5. The plate 48 isvrotatable with lthe gear segment 39 by meansof the pins 53 secured in the segment 39 and traversing slots 54,provided in the plate 48 as shown in Figures 3 and 5.

A curved slot v55 is provided at one end of the plate 48 and has one endof a rod 56 enga ed therewith which is slidably mounted in a earingprovided in the wall separating the interior of the tubular casing 5from the interior of the gear housing 6. The opposite end of the rod 56is pivotally connected with an arm 57, pivoted at 58 to the wall of thecasing 5 and depending therefrom as shown in Figure 1. A control rod 59has one end connected to the arm 57 andits opposite end to a link 61,pivoted at 62 to one of the brackets 2. The axis of the pivot 63connecting the link 61 with the rod 59 is substantially alined with theaxes of the pivots 3, supporting the motor 4 and the propeller mounting,so that tilting movement of the motor and mounting upon the pivots 3will not change the adjustments of the plate 48. A rod 64 is connectedwith the rod 59 and link 61 andextends forwardly tothe operators seat.

In Figure 5, the detent 52 is 'shown engaged with the abutment 51 at theright hand. side of the figure, which corresponds 5, thereby arrestingfurther movement of the iso housing 15 and, therefore the propeller 34.The head 11, carrying the detent 52, constantly tends to rotate in thedirection indicated by the arrow in FigureA 5, so that each time theplate 48 is moved from one position to the other, the propeller and thehousing 15 will berotated a half revolution about the axis of theintermediate shaft 29. When the propeller is positionedvas indicated indotted lines in Figure 1, the boa-t will be moved in a rearwarddirection, and, when positioned as shown in full lines in yFigure 1, theboat willbe moved forwardly when the propeller is operated. Thus, itwill'be seen that the forward and rearward movements of the .boat iscontrolled entirely by movement of the control rod 64- Another featureof the invention resides in the provision of the strut 65, shown inFigures 1V and 2. This strut, it will be noted, has a. ball-and-socketconnection 66 with the lower portion of the housing 15 and vhas itsupper end slidably and pivotally connected with the bottom of the boat,by means of-a slotted bracket 67- and pin 68. The strut 65 provides aguard for the propeller, and, because of its pivotal connection with thehousing 15and its sliding connection with the bottom of the boat, whenthe strut engages an obstruction in the water or the bottom of the lake,the strut will move the propeller mounting upwardly to the positionshownin Figure 2, thereby preventing the propeller formv striking thelake bottom or coming in direct contact with obstructions, such as logsor stones, reposing at the bottom of the lake.

A cable 69 has one end connected to the tubular casing 5 and passesupwardly over a sheave or pulley 71, thence forwardly to the operatorsseat. This cable provides means for manually elevating the propeller asshown in Figure 2. A second cable 72 is connected with the bottom of thecasing 5 and passes under a pulley 73, secured to the bottom of the boatand thence forwardly to the operators seat. This cable provides means'for forcibly holding the mounting and propeller in the position shown inFigure 1, when the propeller is operated in re verse, as indicated indotted lines in Figure -1,1`an'd particularly when starting'the vesselwhen heavily loaded. Under ordinary conditions, the cables69 and 72 areleft sufliciently slack to allow the propeller mounting to be oscillatedby the strut 65, should the latter engage an obstruction in the water. Acover plate 7 4 is detachably secured to the gear housing 6 so thataccess may be had to the interior thereof Referring to Figures 1 and 2,it will be noted' that the tubular casing V5, in this-instance, projectsthrough'the Vrear wall 2O of the boat, and to permit vertical movementof the casing with respect to the wall 20, an elon- `gatedr opening 30'is provided therein as shown. To prevent leakage between the casing 5and the slotted opening in the rear wall of the boat, a plate i() isslidably mounted in guides secured to the rear wall 20, as'shown inFigures 6 and 8. The plate l0 has a relatively shorterelongated openingadapted to receive the casing 5 and to permit vertical movement of thecasing there in. A second plate 7 0 has an aperture adapt ed'tosnuglyreceive 'the casing 5, as shown in Figure 1.' This plate ismovable with the casing and is supported in run-ways provided in theguides 50 as snown in .Figures 6 and 8. The joint between the plate 70and the casing 5 is provided with suitable packing, not shown, toprevent leakage.

Figures 6 and 7 illustra-te a modified form wherein the engine 75 istiX-edly mounted in the boat and the tubular casing 5 is pivotallyconnected thereto by suitable pivots 76. The drive shaft 16 is providedwith a universal joint 77 so that the mounting may be verticallyadjusted while the propeller is being operated. f

Figures 8 and 9 illustrate another modified form wherein twin enginesWSarer employed -instead of a single engine, such as shown in Figures 1,2, 6, and 7. In this instance, the tubular casing 5 is shown as having agear housing 7 9 provided at one end thereof and pivotally connected tothe crank shafts 81 of the engines 78. A spiral gear 82 is secured tothe crank shafts 81 and meshes with a similar gear 83, secured tothedrive shaft 16. Inthe form here shown, the engines 78 are alsostationary and the propeller mounting, including the tubular casing 5,will swing about the aXis of the engine crank shafts 81'.

We have found that by mounting and operating the propeller as shown anddescribed in this application, the boat may be conveniently operated inshallow water, as the strut positively prevents the propeller fromstriking objectsv in the water and, likewise, it prevents it fromstrikingr the bottom when the boat is cruisingv in shallow water. Also,by mounting the propeller ahead of the housing 15 and member 13, it isrendered more effective than when mounted back of its supporting means,as is customary in most propeller rn'ountings.' The boat may beconveniently guided in the water by simply manipulating the cablesections 46 to slightlyv oscillate the propeller, thus ldispensing withthe use of a rudder.y The operation of reversing the movement ofthe boatin the water is also very simple and positive in operation, it beingonly necessary to shift the position 0f the plate 48, vwhereupon thetorqueofthe intermediate shaftlll-9 will immediately swing the propellerfrom its forward to its reverse position, indicated in full and dottedlines, respectively, in Figure 1. It will also be noted that the pivots3 supporting the motor 4are located comparatively close to the bottom ofthe boat so as to decrease the pulling angle of the propeller withrespect to the horizontal, when the propeller is operating in reverseposition. By minimizing this angle, the tendency of the propeller tolift, when operating in reverse, will be lessened. We have also foundthat by thus mounting the propeller and its ,opera-ting means in theboat, verse when the boat is moving forwardly in the water withoutdanger of imparting 'excessive stra-ins to the rear end ofthe boat,because of the fact thatV the propeller and its supporting 'means willtend to lift-,in the waterwhen thus suddenly thrown from forward toreverse. f

, Theapparatus as shown in Figures 1 and 2, may be assembled as a unitand installed in a 'boat within a comparatively short length of time.rThe structures shown in Figures 6 to 9, inclusive, are adapted forlarger vessels wherein heavy motors are used which may be too heavytotilt to the position' shown in Figure 2. i lVe claim as our invention:A 1. In a propeller mounting for boats1 the combination of 'asupporting member having a shaft journaled in one end thereof, apivthe'propeller may be shifted into rer otal support within the boatfor said mountf ing, a propeller `secured to sai-d shaft and offset fromthe' longitudinal center line of said mounting and having itsaxis'arranged substantially parallel to said center line, said pivotalsupport being located a suitable disi tance forwardly of the propellerto cause'the mounting, when the propeller is operating in reverseposition and und r normali conditions, to substantially r Y ts normalposition, but when subjected to an abnormal load, i

while inV reverse, said mounting and propeller will automatically liftto relieve the parts of excess strains. f

2. In a propeller mounting for boats, the

combination of a supportin member having f distance between said axesbeing less than the horizontal distance between the axis of said pivotalsupport and the medial plane of the propeller, thereby causing thepropeller to retain an operative position in the water without a lock,when operating under normal conditions to propel the boat rearwardly,and a strut having one end pivotally connected to said supporting memberbelow and adjacent to said propeller shaft, and the opposite end of saidstrut having a movable connection with the bottom of the boat, saidstrut previding a guard for said propeller when cruising in shallowwater, and also functioning to automatically elevate the propeller andmounting when said strut engages an o-bstruction in the water.

3. In a propeller mounting for boats, the combination of a supportingmember' having a shaft journaled at one end thereof and having apropeller secured thereto, a pivotal support for said member locatedwithin the boat and forwardly of the propeller, a strut having one endivotally connected to said supporting mem er below and adjacent to saidpropeller shaft, and the opposite end'of said strut having a movableyconnection with the bottom of the boat, said strut extending.downwardly beneath the propeller and providing a guard therefor, andalso functioning to elevate the propeller and mounting when said strutengages an obstruction in the water, and the distance between the axisof said pivotal support and the medial plane of the propeller beinggreater than the distance between the axesof the pivotal support anlsaid propeller. l

4. In a propeller mounting, the combination of a supporting member, apivotal sup port for one end of said member located 1n a boat, a shaftjournaled in the opposite end of said supporting member and having apropeller secured thereto and adapted for swinging movement in avertical plane, and said pivotal support being located forwardly of theplane of said propeller and above the axis thereof, the distance betweenth-e axis of said pivotal support and the medial plane of the propellerbeing greater than the distance between the axes of the pivotal supportand the propeller, whereby said propeller mounting will retain asubstantially normal operating position, when the propeller is operatingin reverse and with a substantially normal load, and when operating inreverse under an abnormal load the propeller mayrlift to a moreineHective position in the water to relieve the parts of excessivestrains.

5. In a -propeller mounting, the combination of a supporting member, apivotal support for one end of said member located in a boat, a shaftjournaled in the opposite end of said supporting member and having apropeller secured thereto and adapted for swinging movement in ahorizontal plane, to guide the boat, said pivotal support being locatedforwardly of and above Asaid propeller, wherebysaid propeller mountingwill retain a substantially normal operating position, when thepropeller is operating'in reverse and with a normal load, and whenoperating in reverse under an abnormal load, said propel-v ler isadapted to automatically lift to a more ineffective position in thewater to relieve the parts of excessive strains, and a strut having itsforward end movably connected with the boat bottom, extending downwardlytherefrom beneath the propeller and having its rear end pivotallyConnected with thev lower portion of the supporting member.

6. In a propeller mounting, the combina-` tion of a casing adapted forconnection with an engine mounted within a boat, a member rotatablyconnected with said easing v and depending therefrom, a propellerjournaled in the lower end of said member, means operatively connectingthe propeller with the engine, and means vfor rotating said member to`swinO the propeller with respect to said cas` ing toguide the boat, saidcasing and mem beiv being mounted yfor a swinging movement and adaptedto automa-tivally vertically adjust the propeller in the water.

7. In a propeller mounting, the combination of a casing adapted forvconnection with an inboard engine, said `casing rtraversing the rearwall of the boat and movable therein, a member rotatably connected withsaid casing and depending therefrom, a shaft 4journaled in the lower endof said member and having a propeller mounted thereon, means operativelyconnecting the propeller shaft with the engine, and means for rotatingsaid member to swing the propeller shaft in aplane sub'- stantiallyparallelto the longitudinal centerline ofsaid casing, wherebythe-propeller may be adjusted to guide the boat.

8. A propeller mountingncomprising a casing adapted for connectionwithan inboard engine, one end of said casing projecting through the rearwallo'f the boat and having a hub depending therefrom, a member rotatably connected with said'hub and having a propeller journaled inthelo-wer end. thereof, means operatively connectingsaid propeller withthe engine, means for retainingL said member in adjusted positions, andmeans for releasing said member, whereby the torque of the drivingconnection between the propeller and engine will cause the member to berotated a half revolution to reverse the direction of movement of theboat.

9. A propeller .mounting comprising a casingy adapted for connectionwith Lan engine mounted withina boat,-one end of saidcasing projectingthrough the rear'wall of the boat and having-a hub depending therefrom,a'member rotatably connected with said hub vand having a propeller journaled in the lower` end thereof, means operatively connecting saidpropeller with the engine, control means Afor partially rotating saidmember to swing the propeller with respect 'to Vsaid casingto guidetheboat, andmeans for temporarily releasing said member from saidcontrol means, whereby the torque of the driving connection between thepropeller and engine will cause the member to be rotated a half revo#lution to reverse the direction of movement of the boat.

' l0.L A propeller mounting comprising a casing adapted for connectionwith an engine mounted within a boat,one end of said casing projectingthrough the rear wall of the boat and having a hub depending therefrom,a

member rotatably connected with said hub and having a propellerjournaled in the lower end thereof, means operatively connecting saidpropeller with the engine, a gear segment operatively connected withsaid member, means for'manually actuating said gear segment to partiallyro-tate said membervto vswing the propeller with yrespect to saidcasing, and means for releasing said member fromsaid segment whereby thetorque of the driving connection between the propeller and engine Willcause the member to be rotated a half revolution to reverse thedirection of movement of the boat, and the propeller-sup- A portingendof said mounting being adapted to swing in a vertical plane to raise thepropeller to a higher position in the Water, whereby the propeller mayclear obstructions.

llrA propeller mounting comprising an engine adapted to be mountedwithin a boat, a

vcasing connected therewith and'projecting through the rear wall of theboat` a gear housing terminally provided on said casing, and having amember rotatably connected therewith and depending therefrom, apropeller journaled in the lower end of said member, a drive shaft insaid casing connected with the engine, an intermediate shaft operativelyconnecting said drive shaft with said propel- J ler, and saidpropeller-supporting member being adapted for swinging movement in aplane 'substantially parallel to the axis of said drive shaft to guidetheboat, and the propeller-supporting end of said mounting ing a member`rotatably connected therewithv andvdepending therefrom, a propellerjournaled in the lowerend ofV said member, said casing, housing andmember being adapted for vertical movement to relatively adjust thepropeller in the water, a drive shaftin said casing connectedwith theengine, an inter- 13. A propeller mounting comprising an engine adaptedto be mounted i ithin a boat, a casing connected therewith and projectinthrough a wall of the boat, al gear housing terminally providedon saidcasing and having a member rotatably connected therewith dependingtherefrom, a propeller jour'- naled i the lower end of said fmember andnormally positioned forwardly thereof, a drive shaftin said casingconnected with the engine, an intermediate shaft operatively connectingsaid drive shaft'V with the propeller, and a strut connected with saidmember and the boat and normally positioned to be engaged by anobstruction inthe water to protect the propeller and to automaticallylift the propeller over such obstruction; y let. A propeller mountingcomprising an engine having a casing connected therewith and adapted toproject through 'a wall of a boat, a g lioiising terminallyprovided inthe casing, aV member rotatablyvconnected with housing and dependingtherefrom, a propeller journaled in the lower end of said member a driveshaft in said casing "i 5 connected with the engine, an intermediateshaft mounted in housing and member and having geared connections withsaidL driveshaft and propeller shaft, the torque of the intermediateshaft constantly tending to rot-ate said member with respect to saidhousing, means for manually partially rotating said member to change theposition of the propeller with respect to the housing and forcontrolling movement of the boat in the water, spaced abutments and adeteiit for locking the propeller supporting member in either forward orreverse positions, means for releasing said detent from said abutinents,whereby the torque of said intermediate shaft will canse the propellerto shift' from one position to theother.

15. A propeller mounting comprising an engine adapted to be mountedwithin a boat,

a casing connected therewith and projecting through an aperture'providedinthe rear wall of the boat, a gear housing terminally provided on saidcasing and having a member 4- I I l .xa

rotataoly connecten therewith and depending therefrom, a propeller journaled in the andy lower end of said member, said casing being,V

adaptedfor vertical movement to relatively adjust the position of thepropeller in the water,l drive shaft in said casing connected with theengine, and an intermediate shaft operatively connecting said dr'veshaft with said propeller. y A 16. A propeller mounting` comprising anengine adaptedto-be mounted within a boat,

a casing connected therewith andV projecting laws through an apertureprovided in the rear Wall of the boat, a gear housing terminallyprovided on said casing and having a meniber rotatably connectedtherewith and depending therefrom, a pro-peller journaled in the lowerend of said member, said casing being adapted for vertical movement insaid boat Wall to relatively adjust the position of the propeller in theWater, a drive shaft in said casing connected With the engine, anintermediate shaft operatively connecting said drive shaft With saidpropeller, and said propeller supporting member being adapted forswinging movement to provide means for guiding the boat in the water.

17. The combination with a boat having an aperture in the rear Wallthereof, of a propeller mounting comprising a casing having one endpivotally supported Within the boat and connected With an engine, saidcasing traversing the aperture in said rear boat Wall, and having adepending portion located exteriorly of the boat, a propeller mounted insaid depending` portion, and saidv casing being adapted for up-and-dovvnmovement in said aperture to relatively adjust the position of thepropeller in the Water.

18. rlhe combination with a boat having an elongated aperture in therear Wall thereof, of a propeller mounting comprising a casing havingone end pivotally supported Within the boat and connected With anengine, said casing traversing the aperture in said rear boat Wall andhaving a depending portion located exteriorly of the boat, a propellermounted in said depending portion, said casing being adapted forup-and-dovvn movement in said aperture to relatively adjust the positionof the propeller in the Water, and means movable with said casing andcooperating With means on said rear boat Wall to prevent leakage aroundsaid casing.

19. In a propeller mounting, a transmission housing carrying apropeller', a substantially horizontally disposed drive shaft extendingfrom the housing through a Wall of the boat and connected to an enginemounted Within the boat, a pivotal support for said housing, means forturning the propeller to steer the boat, and means permitting saidmounting and propeller to raise from normal operating positionautomatically, When meeting an obstruction.

20. In a propeller mounting, a housing having a transmission therein, apropeller supported by the housing and operatively connected with saidtransmission, a substantially horizontally disposed drive shaftoperatively connecting said transmission With an engine Within a boatand extending through a Wall of tne boat, a pivotal support for saidhousing, and means for turning the propeller to guide the boat, saidmounting and propeller being adapted to be tilted automatically fromnormal operating position When the boat meets an obstruction in thetravel of the propeller.

21. In a propeller mounting, ya housing having a transmission therein, apropeller supported by the housing, means operatively connecting thepropeller With the transmission, a substantially horizontallyv disposeddrive shaft operatively connecting said transmission With an engineWithin a boat `and extending through a Wall of the boat, a pivot-alsupport for said housing, means for turning the propeller to gu-ide theboat, and means operable vto permit said mounting and propeller to raiseautomatically from normal operating position, when a member engages anobstruction in the Water.

22. In a propeller mounting, a` housing having a transmission therein,means depending from said housing and supporting a propeller, meansoperatively connecting the propeller With said transmission, asubstantially horizontally disposed drive shaft connecting thetransmission with an engine. Within a boat and extending through a Wallof the boat, a pivotal support for said housing, and means for turningthe propeller to guide the boat, said mounting being adapted to swingabout the axis of said pivotal support With the parts in normaloperating position to automatically clear an obstruction in the Water.

23. In a propeller mounting, a housing having a transmission therein,means depending from said housing and supporting a propeller, meansoperatively connecting the propeller with said transmission, asubstantially horizontally disposed drive shaft connecting thetransmission With an engine Within a. boat and extending through a Wallof the boat, a pivotal support for said 'housing and propeller, andmeans in connection With the mounting for guiding the boat, said pivotalsupport permitting the propeller in the normal operating position of theparts to swing about the axis thereof to' automatically clear anobstruction in the Water.

24. In a tiltable propeller mounting, a rotable support attached to saidmounting and carrying a propeller, means connecting the propeller Withan engine mounted Within a boat, means for rotatably adjustingthepropeller to steer the boat, and means for releasing said support -sothat the torque of the propeller Will turn the support a partialrevolution for reversing the direction of movement of the boat, and saidmounting passing through a Wall of the boat and adapted for relativemovement therein.

' 25. A boat propulsion, comprising a normally tiltable transmissionunit, a drive shaft operably connecting said transmission unit yWith anengine mounted Within a` boat, a substantially vertical supportrotatably connected With said transmission unit and carrying apropeller, said verticalsupport and pro- .Two

peller being releasable so that the torque of the propeller Will turnthe vertical support a partial revolution to reverse the direction ofthe boat, said transmission unit and support being, in the normaloperating position of the parts, 'automatically tiltable by contact Withan obstruction in the Water, and said drive shaft extending through aWall of the boat an adapted for relative movement 10 therein..

In Witness whereof, We have hereunto set our hands this 29th day ofOctober, 1931.

ROBERT T. SVENDSEN.

DAVID G. CHANDLER.

